Board Thread:Pokémon Help/@comment-32211283-20171117043427/@comment-27535813-20171118123004

In general, any PVP team shouldn't consist of more than 1 mega and/or more than 1 Z-Crystal holder. Strategy should be emphasis on how well you have already made your team to adapt and survive in the PVP environment, not to add "extra options" just to waste item slots when you can't mega the 2nd Pokemon or use your 2nd z-move.

Mega Sceptile can easily use Leaf Storm over Leaf Blade, it's main purpose is to simply hit hard, hit fast and then remove any of your opponent's Pokemon that threatens your team. However, take note of the low PP it has. There is also Giga Drain, Energy Ball and Solar Beam(should only ever be used in a sun team) if you don't like the drop, or you can simply replace one of your other moveslots with one of these moves for sweep. This means you can have a special Moveset with Leaf Storm and Giga Drain/Energy Ball. Once Move Tutor comes out, you should teach it Dragon Pulse to get the Dragon-type STAB as well. Focus Blast works, or if you can get HP Fire then that's fine too.

(General Set) - Leaf Storm - Dragon Pulse - Giga Drain / Energy Ball / Focus Blast - Hidden Power Fire / Focus Blast

Once you established that you want Mega Sceptile or not, then you need to look at what it synergises with. Teambuilding is a very important aspect and should not be overlooked by simply slapping other Pokemon in. A very common question to ask yourself first is what Sceptile cannot handle. Looking through the moveset it has, you know it cannot 100% check Fairy-types(especially how most of them have high Sp.Def stat), so you can consider Pokemon that check them, such as Scizor(can also provide U-turn/defensive support), Magnezone(provides Magnet Pull support to trap Steel-types that deter Mega Sceptile from spamming), and Heatran(helps absorb Fire-type attacks as well). Synergy is important to form a stable core. As listed of each Pokemon, they also have extra capabilities so you can always consider them too.

Mega Sceptile as threatening as it is, may not be able to get the 'right' Pokemon that it wants to hit, which means that it may be hitting things that resist its attacks or walls. So for things it resists or unable to retaliate, you can always consider the option of a lure, such as Rotom-Wash to attract Ground-types, Water-types and Electric-types while being able to volt switch to Mega Sceptile and bring Mega Sceptile in safely to allow it to check said opposing Pokemon. Pokemon such as Primarina can also help lure or wallbreak Pokemon like eviolite Chansey, which helps soften and make it easier to kill such tanky Pokemon.

Then you have more parts of the teambuilding process, you also need something to help set entry hazards and make your life easier sweeping with Mega Sceptile, you will surely need a Pokemon that can help remove entry hazards such as Sticky Web, and you may also need to consider volt-turn, wish-passing and priority support.

These are helpful links that help to show you the process of teambuilding or to test out your team:

Pokemon Showdown(a simulator)

Pokemon Showdown - Damage Calculator

Gen 6 - Teambuilding Guide (may be a bit outdated)

Competitive Tutoring Teambuilding Guide

Smogon - Checks and Counters definition